load JS in custom HTML

[ogerly]

I tie a pinterest.
to an external js file must be included.

examle: http://www2.sender.fm/topic/55/pinterest-einbinden

I always have to just press F5 thus appears pinterest.

<script type="text/javascript" async defer src="//assets.pinterest.com/js/pinit.js"></script>

in the Custom HTML I have installed the following code.

I think that is not loaded properly.

[Tanguy Bodin-Hullin]

Hi, I have a trouble with embedding an external script into a custom page, like you had.
What solution did you find to make it working finally ?